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Estudo numérico do escoamento em planícies de marés do canal Norte (estuário do rio Amazonas)

2015; Taylor & Francis; Volume: 2; Issue: 1 Linguagem: Inglês

10.1016/j.riba.2015.04.002

2529-8968

Marcos Nicolás Gallo, Susana B. Vinzón,

Geological formations and processes

The analysis of the flow in tidal flats is essential to understanding the hydrodynamics of estuarine areas in the presence of macrotides. The river flow influence on tidal flats hydrodynamics is a rarely subject addressed in the literature. This numerical study was developed in the final stretch of the North Channel of the Amazon River, where a detail modeling was used to characterize the flow in the flooded regions due the tides. The tides control the water levels fluctuations, velocities and times of flooding and exposition inside the flats. The effect of river flow is only noticed in the upstream tidal flats, through changes in mean water levels, flats widths and velocities patterns, dampening the flood currents and amplifying the ebb's. The flats were classified as flood-dominant systems, although the main channel has dominance in the ebb currents due to the presence of river flow. The numerical results indicated that tidal flats would be responsible for energy dissipation in the stretch under study and the generation of areas favoring the deposition of sediments near the coast.